ASTM A403 WPS31254 Duplex Stainless Steel 254SMO Fittings 90 Degree LR Elbow
ASTM A403 WPS31254 / 254SMO Duplex Stainless Steel Elbow 90 Degree LR Elbow
S31254 (UNS S31254), commonly known as 254 SMO (a trademark of Outokumpu), is a super austenitic stainless steel designed for extreme environments. Even though S31254 is more expensive than standard stainless steels, it's cheaper than nickel alloys. So in applications where nickel alloys might be considered, 254 SMO could be a cost-saving alternative without compromising performance. That’s a significant advantage.
Equivalent Grades of ASTM A403 WPS31254 Duplex Stainless Steel Pipe Fittings
| STANDARD | UNS | WERKSTOFF NR. | EN |
| 254 SMO® | S31254 | 1.4547 | X1CrNiMoCuN20-18-7 |
Chemical Composition of ASTM A403 WPS31254 Duplex Stainless Steel Pipe Fittings
| Grade | C | Ni | Si | N | S | Mn | P | Cr | Ce | Fe | |
| SS 254 SMO | min. | - | 17.5 | - | 0.18 | - | - | - | 19.5 | 0.03 | Balance |
| max. | 0.02 | 18.5 | 0.08 | 0.22 | 0.01 | 1.00 | 0.03 | 20.5 | 0.08 | ||
Mechanical Properties of ASTM A403 WPS31254 Duplex Stainless Steel Pipe Fittings
| Grade | Tensile Strength (MPa) min | Elongation (% in 50mm) min | Yield Strength 0.2% Proof (MPa) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 254 SMO | 650 | 35 | 300 | 50 | 70 |
ASTM A403 WPS31254 Duplex Stainless Steel Pipe Fittings
| Specification | ASTM A403, ASTM SB 366, ASTM B564, ASME SB564, En 2.4816 UNS S31254 |
| Dimensions Standards |
ASME B16.9, ANSI B16.9, ASME B16.28, ANSI B16.28, ANSI B16.25, MSS-SP-43, MSS-SP-75 |
| Size Range | S31254 / 254 SMO Seamless Butt Weld Fittings: 1/2″ – 10″ S31254 / 254 SMO Welded Butt Weld Fittings: 1/2″ – 48″ |
| Wall Thickness | 20 Swg., 18 Swg., 16 Swg., 14 Swg., 12 Swg., 10 Swg., & Sch. 10, Sch. 40, Sch. 80, STD, 60, 80, XS, 100, 120, 140, 160 Sch XXS |
| Type | Seamless / Welded / ERW/ Fabricated / Forged |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Applicable Standards | 1-ASME B 16.9 for large Bore 2-ASME B 16.11 for small Bore (socket welded) 3-ASME B 16.25 for butt weld ends 4-ASME B 16.28 for small radius elbow |
| Surface treatment | Sand Rolling, Sand Blasting, Acid Cleaning |
Why Choose S31254 Over Alternatives?
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Lifecycle Cost Savings: Longer service life in aggressive environments offsets higher upfront costs.
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Weight Savings: Higher strength allows thinner sections vs. 316L, reducing material usage.
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Sustainability: Resists degradation, reducing waste and replacement frequency.
Limitations to Consider
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Oxidizing Acids: Avoid nitric acid or strongly oxidizing conditions (risk of accelerated corrosion).
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Thermal Expansion: Higher than carbon steels (requires design accommodation).
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Initial Cost: More expensive than 316L/304 but cheaper than nickel alloys.
Application
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Offshore Oil & Gas:
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Subsea pipelines, umbilicals, and heat exchangers exposed to chlorides and H₂S.
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Desalination Plants:
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Reverse osmosis (RO) systems, brine heaters (resists scaling and pitting).
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Chemical Processing:
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Reactors, scrubbers, and piping for sulfuric acid, phosphoric acid, and chloride-containing media.
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Flue Gas Desulfurization (FGD):
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Resists acidic condensates (pH 2–4) with chlorides and fluorides.
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